Sectional molds for y-type sewer tile



March 29, 1955 R. J. KINGSTON SECTIONAL MOLDS FOR Y-TYPE SEWER TILEFiled Sept. 25. 1952 2 Sheets-Sheet 1 Fig. 2

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March 29, 1955 R. J. KINGSTON SECTIONAL MOLDS FOR Y-TYPE SEWER TILEFiled Sept. 25, 1952 2 Sheets-Sheet 2 Richard J. Kingston INVENTOR.

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BY and aw Fm United States Patent SECTIONAL MOLDS FOR Y-TYPE SEWER TILERichard J. Kingston, Ogden, Utah Application September 25, 1952, SerialNo. 311,493

4 Claims. (Cl. 25-127) My invention relates to improvements in sectionalmolds for forming Y-type sewer tile out of concrete, or the like, byspinning the mold in a machine for centrifugal molding, the mold beingdesigned as an improvement over that forming the subject matter of my U.S. Patent No. 2,404,966, dated July 30, 1946.

The primary object of my invention is to prov1de a practical, eflicientmold for forming Y-type sewer tile with either a single, or a pair oflateral branches selectivel Aiiother object is to provide a mold for theabove purpose embodying a pair of branches either of which may be usedfor forming a single branch on the tile.

Another object is to provide a mold with a pair of branches, and coresfor the branches molding a pair of branches, on the tile, and means forclosing either of the branches to mold a single branch on the tile.

Still another object is to provide cores for the branches of the moldwhich are inflatable under internal pressure, for molding purposes, anddeflatable for easy and quick removal from the branches of the tile.

Still another object is to provide extensible, inflatable cores for thebranches of the mold for forming with the branches bell-mouth ends onthe branches of the tile.

Still another object is to provide a rigid core for the branches of themold for use in either branch as a dummy core to close either branch andprevent molding therein while the other branch is being used for moldingpurposes to form a single branch on the tile.

Other and subordinate objects, within the purview of my invention,together with the precise nature of my improvements will be readilyunderstood when the suceeding description and claims are read withreference to the drawings accompanying and forming part of thisspecification.

In said drawings:

Figure 1 is a view in plan of my improved mold in the preferredembodiment thereof;

Figure 2 is a view in longitudinal section taken on the line 22 ofFigure 1;

Figure 3 is an enlarged fragmentary view in transverse section taken onthe line 33 of Figure 2;

Figure 4 is a view in longitudinal section of a modified embodiment ofthe core;

Figure 5 is an enlarged view in transverse section taken on the line 5-5of Figure 4;

Figure 6 is a view in perspective of one of the cores of the modifiedembodiment, forming a dummy core;

Figure 7 is a fragmentary view in transverse section taken on the line7-7 of Figure 2;

Figure 8 is a view in transverse section taken on the line 8-8 of Figure7, and

Figure 9 is an enlarged fragmentary view in longitudinal section takenon the line 9-9 of Figure 1.

Referring to the drawings by numerals, and first to Figures 1, 2, 3, 7,8 and 9, in the embodiment illustrated therein, the mold of my inventionis of Y-form with a cylindrical body 2 having a flared bell-mouth end 3,a straight end 4', and a pair of like coplanar and cylindrical branches4 adjacent the bell-mouth end 3 diverging relatively from opposite sidesof the body 2 toward said end 3, and having flared bell-mouth outer ends5.

The mold is split diametrically through the body 2 and branches 4 intomating half-sections 6, 7 which are detachably secured together by meansof longitudinal edge flanges 8, 9 on opposite sides of said sections 6,7 bolted together, as at 10, and said sections are additionally securedtogether by gusset plates 11 on said sections 6, 7 extending between thebell-mouth end 3 and said bellmouth ends 5 and which are adapted to bebolted together, as at 12, in opposed pairs. The mold is formed ofsuitable cast metal.

A circular closure plate 14 for the bell-mouth end 3 of the body 2 isdetachably bolted, as at 15, to semi-circular edge flanges 16, 17 on thesections 6, 7 at said end 3. A circumferentially stepped core 18, suchas disclosed in my aforesaid patent, is carried by the closure plate 14to form an annular stepped groove 19 in the bell-mouth end 20 of thetile 21.

A circular closure ring 22 for the straight end 4' of the mold isdetachably bolted, as at 23, to semi-circular end flanges 24, 25 on thesections 6, 7 at said straight end 4' of the mold and carries ananuular, tapered core 26, such as is disclosed in my aforesaid patent,for forming a reduced tongue 27 and a shoulder 28 on the tile 21 at thestraight end of the mold. As will be understood, the tongue 27 andshoulder 28 of one tile are designed to fit in the stepped groove 19 ofanother tile, with clearance suflicient for packing in the joint.

An extensible, inflatable core 35 is provided for each branch 4. Thesecores each comprises a hollow cylindrical member 36 of molded rubber, orrubber composition. Each member 36 is provided with a flat front end 37enlarged and circumferentially stepped like the core 18 to form in thebell-mouth end of the branch 4 an annular stepped groove 38 for the samepurpose as groove 19, and each member 36 has a rear end 39 concave incross-section to correspond in curvature with the internal curvature ofthe body 2, and terminating at said body.

A circular closure plate 40 for the bell-mouth end 5 of each branch 4 isdetachably bolted, as at 41, to semicircular flanges 42, 43 on thesections 6, 7 at said ends 5 of the branches 4, and the member 36 foreach branch 4 has its outer end 37 secured flat, in any suitable manner,to the closure plate 42 coaxially thereof so that the core 35 issuspended by the plate in the branch.

A suitably valved air inlet nipple 47, such as a tire valve, extendsthrough each closure plate 40 and the outer end of the member 35 on saidplate for attachment to an air line, not shown, for inflation of thecore member 36. A suitable pressure relief valve 48 extends through eachclosure plate 40 and the outer end of the associated core glember 36supported thereby for deflating the core mem- The cores 45, that is tosay, the members 36, are constructed and arranged for maximum extensionradially, under air pressure therein, to space the same clear of theinner wall of the branches for a distance corresponding to the thicknessof the tile 21 to be molded.

As best shown in Figures 4, 8 and 9, the branches 4 and body 2 form attheir juncture, adjacent the bellmouth ends 3, 5 a circumferentialchannel 42, for reducing the weight of the mold. To facilitate passageof concrete, under centrifugal molding, into the branches 4 at thesepoints, the sides of the mold at opposite sides of the channel 51 areslotted, as at 53, and the slots bridged, in each instance, by a pair ofplates 54 to form a pair of ports 55 at opposite sides of the moldcoplanar with the split in the mold to be split like the mold andcommunicating the body 2 with each branch 4 so that the concrete mayreadily pass from the body 2 into the branches 4 under centrifugalforce.

A Y-shaped, cylindrical liner 56 of tar paper is provided in the mold.The liner 56 is a unitary structure and provides a jacket for holdingthe concrete in molded shape after it becomes partly set so that themold may be removed before the concrete has become completely hardened.The liner 56, as in my aforesaid patent, is left on the tile 21 when itis laid. As shown in Figure 9, the liner 56 is ported as at 58, like themold to extend through the ports 55, and as shown in Figure 7, the ports55 will mold connecting ribs between the body of the tile 21 and itsbranches. The members 36 may be also molded of metal or other suitablematerial.

In the modified embodiment of the invention shown in Figures 4, 5 and 6,the construction of the mold 60 is the same as in the preferredembodiment. However, a dummy core 62 is provided for closing eitherbranch 4,

selectively, while the other branch is utilized with one of the cores 35to mold a single branch tile. The dummy core 62 comprises a cylindrical,hollow member 63 of sheet metal adapted to be attached to the bell-mouthend of the selected branch 4 by a relatively larger diameter, circularclosure plate 66, like the closure plate 40, bolted, as at 64, to theend 5 of the branch 4, selected, as in the preferred embodiment with theouter end of the member 63 welded to said plate, as at 67. The inner endof the member 63 is closed and the inner end of the selected branch 4 byan enlarged closure plate 69 oblique to the axis of the member 63 whichis welded at its inner end, as at 90, to said plate 69, the plate 69fitting in the inner end of the selected branch 4, that is to say, inthe liner 56, and being curved in correspondence with the outercircumference of the tile 71 to be formed.

As will now be seen, when the mold is set up and placed horizontally ina suitable spinning mechanism, not shown, with the cores 35 in bothbranches 4, and when the concrete is introduced into the straight end 3of the mold, a Y-shaped tile 21 will be molded in a tar paper jacket,under the action of centrifugal force with bell-mouth ends. After theconcrete has set, for a short period of time, the cores 35 may bedeflated and easily pulled out of the molded branches of the tile 21.The sections of the mold may then be detached and the concrete allowedto harden in the liner or jacket 56 so that the mold may be used againto form another tile before the previously formed tile has completelyhardened.

By utilizing the dummy core 62 in either branch 4, a tile with a singlebranch can be molded in the other branch, and by using a dummy core 62in both branches 4, a straight tile may be molded. As will be obvious,when the dummy core 63 is used, the body of the tile 71 opposite theinner end of the branch 4 in which the dummy is positioned will not becovered by the liner 56, and the tile 71 may be set longer in the moldbefore the sections of the mold are detached and removed.

The foregoing will, it is believed, suffice to impart a clearunderstanding of my invention, without further explanation.

Manifestly, the invention, as described, is susceptible of modification,without departing from the inventive concept, and right is hereinreserved to such modifications as fall within the scope of the appendedclaims.

Having described the invention, what is claimed as new is:

1. A mold for forming hollow Y-type tile out of plastic material underthe action of centrifugal force comprising a cylindrical body havingadjacent one end thereof a pair of opposite cylindrical branchesdiverging relatively and provided with open outer and inner ends, a pairof cylindrical cores in said branches spaced from the innercircumference thereof and having outer and inner ends terminating at theouter and inner ends of the branches, the inner ends of the corescurving in conformity with the inner circumference of said body, andmeans detachably attaching the outer ends of the cores to the outer endsof the branches and closing said outer ends of the branches, one of saidcores having means thereon closing the inner end of eitherbranch toprevent molding of the material in the branch, and said cores beinginterchangeable whereby either branch may be utilized for moldingpurposes selectively.

2. A mold for forming hollow Y-type tile out of plastic material underthe action of centrifugal force comprising a cylindrical body havingadjacent one end thereof a pair of opposite cylindrical branchesdiverging relatively and provided with open outer and inner ends, a pairof cylindrical cores in said branches spaced from the innercircumference thereof and having outer and inner ends terminating at theouter and inner ends of the branches, the inner ends of the corescurving in conformity with the inner circumference of said body, andmeans detachably attaching the outer ends of the cores to the outer endsof the branches and closing said outer ends of the branches, one of saidcores having means thereof closing the inner end of either branch toprevent molding the material in the branch, and said cores beinginterchangeable whereby either branch may be utilized for moldingpurposes selectively, said last named means comprising a plate on theinner end of said one core fitting in the inner end of either branch andcurving in conformity with the inner circumference of said body. 7

3. A mold according to claim 1, said one core being of suflicient weightto counter-balance the weight of the other core during spinning of themold.

4. A mold for forming hollow Y-type tile out of plastic material underthe action of centrifugal force comprising a cylindrical body havingadjacent one end thereof a pair of opposite cylindrical branchesdiverging relatively and provided with open outer end inner ends, a pairof cores in said branches spaced from the inner circumference thereofand having outer and inner ends, and means detachably attaching theouter ends of the cores to the outer ends of the branches and closingsaid outer ends of the branches, and a closed channel in said body andbranches extending circumferentially of said body at the juncture ofsaid branches with said body for reducing weight of the mold.

References Cited in the file of this patent UNITED STATES PATENTS

